【Problem Description】:
IGMP streaming issue in the network，channel freeze for some time randomly then go normal.
IGMP source/ Feed is coming in the vlan 464 in core switch and then we are using different vlans for different floors.
IGMP server vlan: 464 …… IGMP source is ISP connected to port GE 1/1/0/10
User/IPTV vlans: 399 to 461.
TOPOLOGY IS LIKE THAT,
IGMP SOURCE IS COMING------------àCORE SWITCH (VLAN:464) --------------------à Edge Switches IDF STACK-------à ROOM Side Switch.
【Problem Analysis】:
1. Login the S5700 and found the CPCAR packet drop by running command“display lsw slot X showdropcnt”check the output Field “CPU code rate limiter Drop Cnt”,there are some packets dropped by CPCAR
2．Modify the CIR parameter from 64 to 256，and you can check the result by running command display cpu-defend configuration all
Configuration command as follow：
Example of change to 256
#
Cpu-defend policy igmp
Car packet-type igmp cir 256
Cpu-defend-policy igmp
Cpu-defend-policy igmp global
#
3- Login the Core switch, and check the information about member ports of multicast group. Sometimes there is no output, but sometimes we can see some normally display information
4- Run command display igmp-snooping router-port v ,to check the IGMP route port information ( IGMP source ) , found the route port is GE1/1/0/10
Then run command “display interface GE1/1/0/10” to check the interface state, we found the port was UP/Down
5- check log buffer, double confirm that the GE1/1/0/10 was UP /Down .... The service is from ISP so need to check ISP side .
【Root Cause】:
1.Route port GE 1/1/0/10 physical link issue, core switch cannot receive IGMP General Query messages from the IGMP source side normally ( ISP ) .
2.CPCAR value is small
【Solution Description】:
1- Check the GE 1/1/0/10 physical link, make sure the port can keep UP
2- Change the S5700 switches CIR from 64 to 256
thank you :)
